Process of severing bars of metal.



' and CHARLES E. ROBERTS, citizens of the Bars of Metal, of which the following is a specification.

' in the manufacture of metal screws. 4 At the moved thereby, amountingto approximately I being secured in a suitable slide or other Imovable support so asto be movable toward and from the bar of stock, a

the bar of stock by means of a cut-01f tool.

one inch (1") long, is absolutely I wasted. This percentage of loss varies with the length of the screws, increasing as the length of the .screws decreases and decreasing as the length consists of the various features and combi- *UNITEI) STATES WALTER B. PEARSON AND CHARLES Patented June '30, 19032 E. ROBERTS, or -OHICAGO,, 'ILLINOIS.

PROCESS .OF SEVERING BARS 0F METAL..-

I SPECIFICATION forming part of Letters Patent No. 732,218, dated June 30, 1903.

Applieationfiled September 12,1902.

To all,whom it may concern/.-

Be it known that we, WALTER B. PnAhson United States, and residents 'pfOhicago, in the county of Cook and State of I-llinois, have nvented an Improved Process of Severing Thisinvention relates to an improved process of severing-bars of metal. i

A particular application of our invention is in severing screws orscrew-blanks from the bars of metal from which they are formed present time such screws are commonly made from bars of stock several feet in length and sired shape and size of the screw-heads, the screws or screw-blanks being severed from The .width of the cut-off tool is about one eighth of an inch, arid the stock retwelve per cent. ofthe stock in making screws of the screws increases, but in all cases amounting to a large percentage of loss.

'The'object of the invention is to avoidthis loss of stock whether in making screws or other articles; and to this end the invention nations of features hereinafter described and claimed.

In severing bars of stock according to our improved process they are first partially sever'ed at the desired point of severance by a groove the bottom of which is angular or V- shaped. A properly-shaped'cut-off' tool of any ordinary form 'of screw-machineaffords convenient means for this purpose, the bar of stock being supported in the revoluble spi'ndie of the machine so that the end there- 'ofiwilisproject therethroughand the cut-off The .expreseion angular'or V-shaped is pot used herein in a strictly technical sense,

as inpractice it is usuallv necessary that the Serial No. 123,113. (No specimens.)

point or angle of the tool which forms the groove be made somewhat blunt, either flattened or rounded,"in order that it may not break or crumble under the duty to which it is subjected in cutting. By said expression angular or V-shaped we therefore mean a groove the bottom of which is sharply angular or bluntly angular, being either flattened or rounded in the manner and for the purpose above described. 7

After the bar of stock has been partially severed in the manner described the sections of the bar'on opposite sides of the groove formed therein are turned or rotated rela-' tively to each other upon their common axis, whereby said bar is twisted or wrung off at the point of partial severance thereof. This may be efiected by wrenches applied to the sections of the bar of'stock or where the bar is partially severed in a screw-machine by grasping the projectingend thereof in a stationary chuck supported in proper position opposite the end of the machine-spindle.-

' In an application for Letters Patent of the United States heretofore filed by usin the Patent Oflice on May 9, 1902, Serial No. 106,620, a machine is shown anddescribed particularly designed and adapted for severing bars of stock according to our improved process, to which reference is made for a full and complete illustration and description of means for severing bars of stock according to our improved process.

We claim The process of severing a bar of metal consisting in partially severing said bar by a groove, the bottom of which is angular or V- shapedand in. then turning the sections of said bar on opposite sides of the point of partial severance relatively to each other upon their common axis, substantially as described.

In testimonythat we claim the foregoing as our invention we affix signatures, in presence of two subscribing witnesses, this 3d day of September, A. D. 1902.

j WALTER B. PEARSON. CHARLESv E. ROBERTS. Witnesses:

, .A. W. ANTHONY,

GEO. 0-. Beware. 

